2021年三年级数学下册面积单位2教案西师大版教案.pdf

《2021年三年级数学下册面积单位2教案西师大版教案.pdf》由会员分享，可在线阅读，更多相关《2021年三年级数学下册面积单位2教案西师大版教案.pdf（3页珍藏版）》请在淘文阁 - 分享文档赚钱的网站上搜索。

1、.1/3 面积单位教学内容教材，例与相关的课堂活动。教学目标1.能结合具体的实物，让学生感觉到每个面积单位的大小。2.通过实践操作，帮助学生进一步的建立cm2、dm2、m2面积单位的空间观念。3.在实践活动的过程中，能对长度单位与相应的面积单位进展比拟，能更好建立长度与面积的空间观念。教学准备教具视频展示台、米尺、在操场上画出一个m2和 m2的正方形。学具直尺、铅笔、纸、剪刀等。教学过程教师活动学 生 活 动复习引入谁还记得上节课我们学的什么内容吗？什么是面积呢？复习面积的定义，抽生答复面积的含义。操作实践探究新知1.感知 cm2做一做。请同学们在一张纸上画出一个边长为厘米的正方形，然后剪下来

2、看一看，这个正方形有多大。学生完成以后，这个边长为厘米的正方形，它的面积就是平方厘米，也可以写成cm2。量一量。估计一下，文具盒的上面大约有多少cm2？量一量，下面的长方形的面积有多少cm2？可以边量边作记号。2.感知 dm2在一张纸上画出一个边长为0 厘米的正方形，然后剪下来看一看，这个正方形有多大。这个边长为 0 厘米的正方形，学生动手操作，独立完成。并在小组内进展交流。介绍平方厘米。同桌合作，动手操作。测量完后，抽生汇报。2学生动手操作，独立完成。并在小组内进展交流。介绍平方分米。精品w o r d 可编辑资料-第 1 页，共 3 页-.2/3 它的面积就是平方分米，也可以写成dm2。估

3、计一下，课桌的面积是多少dm2？量一量，课桌实际的面积有多少dm2？3.感知 m2做一做。在操场上画一个边长为米的正方形，看一看，这个正方形有多大。这个边长为米的正方形，它的面积就是平方米，也可以写成 m2。估计一下，教室的地面大约有多少m2？黑板呢？4.小结：我们刚刚认识的平方厘米、平方分米、平方米都是面积单位。如果要测量和计算更大的面积时，我们还可能用到更大的面积单位，例如：公顷、平方千米等等。同桌合作，动手操作。测量完后，抽生汇报。3.向学生介绍平方米，感受平方米的大小。师生共同小结。精品w o r d 可编辑资料-第 2 页，共 3 页-文档编码:CS3A1A4P3A6 HL9T7X5

4、Y7F9 ZO1L8I1D4B2文档编码:CS3A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2文档编码:CS3A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2文档编码:CS3A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2文档编码:CS3A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2文档编码:CS3A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2文档编码:CS3A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2文档编码:CS3A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2文档编码

5、:CS3A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2文档编码:CS3A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2文档编码:CS3A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2文档编码:CS3A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2文档编码:CS3A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2文档编码:CS3A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2文档编码:CS3A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2文档编码:CS3A1A4P3A6 HL9T7X5

6、Y7F9 ZO1L8I1D4B2文档编码:CS3A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2文档编码:CS3A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2文档编码:CS3A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2文档编码:CS3A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2文档编码:CS3A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2文档编码:CS3A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2文档编码:CS3A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2文档编码

7、:CS3A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2文档编码:CS3A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2文档编码:CS3A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2文档编码:CS3A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2文档编码:CS3A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2文档编码:CS3A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2文档编码:CS3A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2文档编码:CS3A1A4P3A6 HL9T7X5

8、Y7F9 ZO1L8I1D4B2文档编码:CS3A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2文档编码:CS3A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2文档编码:CS3A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2文档编码:CS3A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2文档编码:CS3A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2文档编码:CS3A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2文档编码:CS3A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2文档编码

9、:CS3A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2文档编码:CS3A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2文档编码:CS3A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2文档编码:CS3A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2文档编码:CS3A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2文档编码:CS3A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2文档编码:CS3A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2文档编码:CS3A1A4P3A6 HL9T7X5

10、Y7F9 ZO1L8I1D4B2文档编码:CS3A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2文档编码:CS3A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2.3/3 课堂作业1.课堂活动第题。数出每个图形的面积图中的一格表示平方厘米2.课堂活动第题。用个平方厘米的正方形摆图形，王欢已经摆出了下面个，你还能摆出哪些？3.课堂活动第题。先在操场上分别量出边长为米、米的正方形，再想一想，议一议公顷有多大？课前收集关于公顷的知识。课堂活动第题。说一说生活哪些物体的面大约是平方厘米，哪些是平方分米，哪些是平方米。你能说出哪些地方的面积大约有公顷、平方千米吗？1.抽生汇

11、报测量结果，纠正个别学生不正确的测量方法。2.小组合作，进展操作。3.在教师画出图形的根底上感受平方米、平方米，以与它们之间联系。根据课前的调查，汇报关于公顷方面的知识。4.学生举例说一说，生活中自己了解到的关于面积单位的知识。课堂小结通过今天的学习，你有什么新的收获吗？还有什么问题吗？精品w o r d 可编辑资料-第 3 页，共 3 页-文档编码:CS3A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2文档编码:CS3A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2文档编码:CS3A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2文档编码:CS3

12、A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2文档编码:CS3A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2文档编码:CS3A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2文档编码:CS3A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2文档编码:CS3A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2文档编码:CS3A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2文档编码:CS3A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2文档编码:CS3A1A4P3A6 HL9T7X5Y7F9

13、 ZO1L8I1D4B2文档编码:CS3A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2文档编码:CS3A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2文档编码:CS3A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2文档编码:CS3A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2文档编码:CS3A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2文档编码:CS3A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2文档编码:CS3A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2文档编码:CS3

14、A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2文档编码:CS3A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2文档编码:CS3A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2文档编码:CS3A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2文档编码:CS3A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2文档编码:CS3A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2文档编码:CS3A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2文档编码:CS3A1A4P3A6 HL9T7X5Y7F9

15、 ZO1L8I1D4B2文档编码:CS3A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2文档编码:CS3A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2文档编码:CS3A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2文档编码:CS3A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2文档编码:CS3A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2文档编码:CS3A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2文档编码:CS3A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2文档编码:CS3

16、A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2文档编码:CS3A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2文档编码:CS3A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2文档编码:CS3A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2文档编码:CS3A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2文档编码:CS3A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2文档编码:CS3A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2文档编码:CS3A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2文档编码:CS3A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2文档编码:CS3A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2文档编码:CS3A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2文档编码:CS3A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2文档编码:CS3A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2文档编码:CS3A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2文档编码:CS3A1A4P3A6 HL9T7X5Y7F9 ZO1L8I1D4B2